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This Wera Joker S – part number 7870 – is a seriously clever piece of tool design.
It's a self-adjusting wrench head that covers both 10-13mm and 9x12mm sizes, meaning you don't have to fumble around looking for the right size wrench for common bolts.
It adjusts to the bolt automatically and locks on securely so it doesn't slip.
The ratcheting function lets you work fast without having to reposition the tool each time, which is a huge time-saver on repetitive jobs.
It's built with the quality you expect from Wera – durable, precise, and comfortable to use.



